<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--表单区域-->
      <div class="">
        <el-form  ref="login_ref" label-width="0px" class="login_form" :model="loginForm" :rules="rules">
          <!--用户名-->
          <el-form-item prop="username">
            <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
          </el-form-item>
          <!--密码-->
          <el-form-item prop="password">
            <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
          </el-form-item>
          <!--按钮区域-->
          <el-form-item class="btns">
              <el-button type="primary" @click="validateLogin">登录</el-button>
              <el-button type="info" @click="resetLogin">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'login',
  data () {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 5, max: 12, message: '长度在 5 到 12 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 5, max: 12, message: '长度在 5 到 12 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击登录重置表单
    resetLogin () {
      this.$refs.login_ref.resetFields()
    },
    validateLogin () {
      this.$refs.login_ref.validate(async valid => {
        // 预验证，符合规则返回true，否则发返回false
        console.log(valid)
        // eslint-disable-next-line no-useless-return
        if (!valid) return
        // eslint-disable-next-line no-unused-vars
        const { data: result } = await this.$http.post('login', this.loginForm)
        // 取出后台返回的数据
        // eslint-disable-next-line no-undef
        if (result.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登陆成功')
        /*
        * 1.将登录成功之后的token, 保存到客户端的sessionStorage 中
            1.1项目中出了登录之外的其他API接口，必须在登录之后才能访问
            1.2 token 只应在当前网站打开期间生效，所以将token 保存在sessionStorage 中
          2.通过编程式导航跳转到后台主页，路由地址是/home
        * */
        window.sessionStorage.setItem('token', result.data.token)
        // 跳转至后台主页
        this.$router.push('/home')
        console.log(result)
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 13px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    .avatar_box{
      background: #fff;
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px ;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%,-50%);
      img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
  .btns{
    display: flex;
    justify-content:right;
  }
  .login_form{
    position: absolute;
    bottom: 0px;
    width: 100%;
    padding: 0 10%;
    box-sizing: border-box;
  }
</style>
